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App:rendered hooks in apps in detail

Popularity：35 ℃/2024-10-02 12:23:55

title: app:rendered hooks in apps in detail
date: 2024/10/2
updated: 2024/10/2
author: cmdragon

excerpt:
Abstract: This article describes app:rendered hooks in applications in detail, including their definitions, call timing, context information, and a practical example showing how to log performance and send logs to the server.

categories:

  • front-end development

tags:

  • server rendering
  • life cycle
  • hook function
  • Performance Monitoring
  • Logging
  • SSR optimization

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catalogs

  1. summarize
  2. Definition of the app:rendered hook
  3. Call Timing and Context
  4. Examples of practical applications
    • Example 1: Recording Performance
    • Example 2: Sending logs to the server
  5. caveat
  6. Frequently Asked Questions and Answers
  7. exercise question
  8. summarize

1. General

In theapp:rendered is a hook that can be used to listen for events after server-side rendering (SSR) has completed. It allows developers to perform specific logic after rendering is complete, such as logging, performance monitoring, or handling other operations that require rendering to be completed server-side.

2. app:rendered Definition of Hooks

app:rendered is one of the application's lifecycle hooks, used primarily on the server side. Hooks can be accessed via the function is added, receiving one argumentrenderContext, which contains contextual information about the current rendering.

3. Timing and context of calls

timing of call

  • app:rendered The hook is called after the rendering of each server-side request is complete. This means that the hook is triggered whenever the user requests a new page and the server successfully completes its rendering.

Context parameters (renderContext)

When this hook is called, it provides arenderContext object, which usually contains the following:

  • url: The URL of the current access.
  • state: The current state of the application, including Vuex status, etc.
  • statusCode: HTTP response status code indicating whether the request was successful or not.
  • route: Current matching routing information.

4. Examples of practical applications

Example 1: Recording Performance

In this example, we will record the elapsed time for each rendering to help developers analyze performance bottlenecks.

export default {
  setup(app) {
    ('app:rendered', (renderContext) => {
      const start = ();
      
      // Logic for processing completion
      ('Page rendering complete:', );
      
      const end = ();
      const duration = end - start;
      (`add washes of ink or color to a drawing (Chinese painting) ${} take a period of (x amount of time): ${duration}ms`);
    });
  }
};

In this example, each time a page is rendered successfully, the URL of the page and the time it took to render will be output.

Example 2: Sending logs to the server

In this example, we will demonstrate how to send rendering information to a log server for deeper analysis.

export default {
  setup(app) {
    ('app:rendered', async (renderContext) => {
      try {
        const response = await fetch('/log', {
          method: 'POST',
          body: ({
            url: ,
            statusCode: ,
            state:
          }),
          headers: {
            'Content-Type': 'application/json'
          }
        });
        ('Log sent successfully:', );
      } catch (error) {
        ('Failure to send log:', error);
      }
    });
  }
};

In this example, each time the SSR rendering completes, the relevant information is sent as a POST request to the specified log server.

5. Cautions

  • Performance Impact: Inapp:rendered Performing time-consuming operations in hooks may affect response times, so it is recommended that time-consuming tasks (such as network requests) be processed asynchronously or that the processing logic be simplified as much as possible.
  • stateless: The hook is only called on the server side and will not be triggered on client-side re-rendering.
  • safety:: Ensure that sensitive data is not leaked in logs, especially in production environments.

6. Frequently asked questions and answers

  • Does this hook trigger on the client side?

    • No, it won't.app:rendered Hooks are triggered only after server-side rendering is complete.

  • How do I get the full render state?

    • This can be done by Get component state, Vuex state, etc., but make sure the relevant state is prepared before rendering.

  • How many times will this hook trigger if there are multiple page requests?

    • It is triggered once per request, so if the user requests multiple pages, the hook will be called multiple times, and the context of each call will reflect the current state of the request.

7. Exercise questions

  1. Attempts atapp:rendered The frequency of visits to different pages is analyzed in the hook and stored in the database.
  2. utilizationapp:rendered The hook monitors the URL and status of the user's access and logs the appropriate information if the status is 404.
  3. In conjunction with the Vuex state, attempt to send data about user behavior back to the server after rendering.

8. Summary

app:rendered Hooks play a key role in the SSR rendering process, allowing developers to execute a variety of logic after rendering is complete. By utilizing this hook, developers can perform actions such as performance monitoring, logging, and other operations that enhance the user experience and maintainability of the application.

For the rest of the article, please click to jump to the personal blog page or scan the code to follow or WeChat search:Programming Intelligence Front-End to Full-Stack Communication and Growth, read the full article: App:rendered hooks in apps explained | cmdragon's Blog

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